LXR linux/tools/perf/arch/arm64/util/dwarf-regs.c

   1/*
   2 * Mapping of DWARF debug register numbers into register names.
   3 *
   4 * Copyright (C) 2010 Will Deacon, ARM Ltd.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11#include <errno.h>
  12#include <stddef.h>
  13#include <string.h>
  14#include <dwarf-regs.h>
  15#include <linux/ptrace.h> /* for struct user_pt_regs */
  16#include <linux/stringify.h>
  17
  18struct pt_regs_dwarfnum {
  19        const char *name;
  20        unsigned int dwarfnum;
  21};
  22
  23#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
  24#define GPR_DWARFNUM_NAME(num) \
  25        {.name = __stringify(%x##num), .dwarfnum = num}
  26#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
  27#define DWARFNUM2OFFSET(index) \
  28        (index * sizeof((struct user_pt_regs *)0)->regs[0])
  29
  30/*
  31 * Reference:
  32 * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf
  33 */
  34static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
  35        GPR_DWARFNUM_NAME(0),
  36        GPR_DWARFNUM_NAME(1),
  37        GPR_DWARFNUM_NAME(2),
  38        GPR_DWARFNUM_NAME(3),
  39        GPR_DWARFNUM_NAME(4),
  40        GPR_DWARFNUM_NAME(5),
  41        GPR_DWARFNUM_NAME(6),
  42        GPR_DWARFNUM_NAME(7),
  43        GPR_DWARFNUM_NAME(8),
  44        GPR_DWARFNUM_NAME(9),
  45        GPR_DWARFNUM_NAME(10),
  46        GPR_DWARFNUM_NAME(11),
  47        GPR_DWARFNUM_NAME(12),
  48        GPR_DWARFNUM_NAME(13),
  49        GPR_DWARFNUM_NAME(14),
  50        GPR_DWARFNUM_NAME(15),
  51        GPR_DWARFNUM_NAME(16),
  52        GPR_DWARFNUM_NAME(17),
  53        GPR_DWARFNUM_NAME(18),
  54        GPR_DWARFNUM_NAME(19),
  55        GPR_DWARFNUM_NAME(20),
  56        GPR_DWARFNUM_NAME(21),
  57        GPR_DWARFNUM_NAME(22),
  58        GPR_DWARFNUM_NAME(23),
  59        GPR_DWARFNUM_NAME(24),
  60        GPR_DWARFNUM_NAME(25),
  61        GPR_DWARFNUM_NAME(26),
  62        GPR_DWARFNUM_NAME(27),
  63        GPR_DWARFNUM_NAME(28),
  64        GPR_DWARFNUM_NAME(29),
  65        REG_DWARFNUM_NAME("%lr", 30),
  66        REG_DWARFNUM_NAME("%sp", 31),
  67        REG_DWARFNUM_END,
  68};
  69
  70/**
  71 * get_arch_regstr() - lookup register name from it's DWARF register number
  72 * @n:  the DWARF register number
  73 *
  74 * get_arch_regstr() returns the name of the register in struct
  75 * regdwarfnum_table from it's DWARF register number. If the register is not
  76 * found in the table, this returns NULL;
  77 */
  78const char *get_arch_regstr(unsigned int n)
  79{
  80        const struct pt_regs_dwarfnum *roff;
  81        for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  82                if (roff->dwarfnum == n)
  83                        return roff->name;
  84        return NULL;
  85}
  86
  87int regs_query_register_offset(const char *name)
  88{
  89        const struct pt_regs_dwarfnum *roff;
  90
  91        for (roff = regdwarfnum_table; roff->name != NULL; roff++)
  92                if (!strcmp(roff->name, name))
  93                        return DWARFNUM2OFFSET(roff->dwarfnum);
  94        return -EINVAL;
  95}
  96